git.distorted.org.uk Git - u/mdw/putty/blob - contrib/cygtermd/malloc.h

   1 /*
   2  * malloc.h: safe wrappers around malloc, realloc, free, strdup
   3  */
   4
   5 #ifndef UMLWRAP_MALLOC_H
   6 #define UMLWRAP_MALLOC_H
   7
   8 #include <stddef.h>
   9
  10 /*
  11  * smalloc should guarantee to return a useful pointer - Halibut
  12  * can do nothing except die when it's out of memory anyway.
  13  */
  14 void *smalloc(size_t size);
  15
  16 /*
  17  * srealloc should guaranteeably be able to realloc NULL
  18  */
  19 void *srealloc(void *p, size_t size);
  20
  21 /*
  22  * sfree should guaranteeably deal gracefully with freeing NULL
  23  */
  24 void sfree(void *p);
  25
  26 /*
  27  * dupstr is like strdup, but with the never-return-NULL property
  28  * of smalloc (and also reliably defined in all environments :-)
  29  */
  30 char *dupstr(const char *s);
  31
  32 /*
  33  * snew allocates one instance of a given type, and casts the
  34  * result so as to type-check that you're assigning it to the
  35  * right kind of pointer. Protects against allocation bugs
  36  * involving allocating the wrong size of thing.
  37  */
  38 #define snew(type) \
  39     ( (type *) smalloc (sizeof (type)) )
  40
  41 /*
  42  * snewn allocates n instances of a given type, for arrays.
  43  */
  44 #define snewn(number, type) \
  45     ( (type *) smalloc ((number) * sizeof (type)) )
  46
  47 /*
  48  * sresize wraps realloc so that you specify the new number of
  49  * elements and the type of the element, with the same type-
  50  * checking advantages. Also type-checks the input pointer.
  51  */
  52 #define sresize(array, number, type) \
  53     ( (void)sizeof((array)-(type *)0), \
  54       (type *) srealloc ((array), (number) * sizeof (type)) )
  55
  56 #endif /* UMLWRAP_MALLOC_H */